perret



(No ModeL) 2 Sheets-Sheet 1.

' P. V. FERRET.

STOP WATCH. No. 315,829. Patented Apr. 14, 1885.

(No Model.)

2 Sheets-Sheet 2. P. V. FERRET.

STOP WATCH.

No. 315,829. Patented Apr. 14, 1885.

Fig. i

UNITED STATES PATENT ()rrrcn.

PAUL VUILLE FERRET, OF OHAUX-DE-FONDS, SWITZERLAND.

STOP-WATCH.

SPECIFICATION forming part of Letters Patent No, 315,829, dated April14, 1885.

Application filed December 13, 1884. (X0 model.)

To all whom it may concern.-

Be it known that I, PAUL VUILLE FERRET, of Ohauxde-Fonds, Switzerland,have in vented a new and useful Improvement in Stop- WVatches, of whichthe following is a specification.

My invention is designed as an improvement upon the stop-watch set forthin Letters Patent No. 305,159, granted September 16, 188i, in whichpatent the cam is made with a series of inclines, which inclines actagainst a nose upon the operating-lever. There is also a cone bearingagainst a conical recessed pinion, and said cone is made as one with thecentral axis or arbor of the watch, and there is a heartcam and a collaragainst which the stop-lever works. These are separate pieces fastenedupon said axis, and the conical recessed pinion revolves upon a sleeveprojecting from a plate that is secured upon the main plate of themovement.

In myimprovement the operating-cam has notches and two sets ofbearing-surfaces upon its periphery, which surfaces are formed as arcsof circles struck from the center of the cam, and I provide a lever, oneend of which operates the heart-cam, and the other end of the lever hasa return-bend with an inclined end to be acted upon by the said cam, andI form the heart-cam and cone and collar in one piece, secured by asingle pin upon the axis, the cone being on one side of the heart-camand the collar upon the other, and I make the center wheel and pinionwith a cannon-arbor passing through and taking a bearing in the mainplate, and projecting as a tubular arbor, around which theconically-recessed pinion is moved continuously by the train ofgearingin the watch.

In the accompanying drawings, Figure 1 shows the pieces forming mychronograph mechanism. Fig. 2 is a section, in larger size, through theprincipal parts of the same. Fig. 3 shows the way in which the completemechanism is placed in relation to the watchmovement. Fig. 4 is asection through 00 y of Fig. 3, and Fig. 5 shows the cam-wheel. Fig.(Sis a detached section of the levers Q and F.

A is the push-piece, acting upon a springlever, B, which is providedwith a pawl or click, 0. By pressing down the push-pieceA the click 0engages the ratchetwheel D and turns the same and a cam, M, of theespecial form shown in larger size in Fig. 5. By a spring-pawl, 0,bearing with its end against the teeth of D, the cam M is held againstbackward rotation. The levers E and F are fixed to one'another andoscillate upon the stud F. The spring G causes the end of the lever F tomove toward the center of the watch as soon as the extremity of E, whichleans against the cam M, falls into one of the three notches of thelatter. The cam M is provided with three notches, 1, 4, and 7, cutintothe cani,a11d with two series of bearings, 2, 5, and 8, and 3, 6, and 9,upon the periphery of the cam, and formed as arcs of circles struck fromthe center of the cam. The chronograph-hand S, Fig. 4, is fixed on anaxis, R, which turns freely in the hole of the pinion V of thewatch-movement. On the same axis, B, there is affixed a heart-cam, P,provided with a conical clutch, P, and with a collar, P, beneath whichis received the forked end of the spring-lever Q. The chronograph-pinion0 turns freely on a tubular arbor upon the cannon of the pinion V, (seeFig. 2,) and is held into the recess in the bridge K by a spring, T,fixed in the head of a screw, U. The pinion O is continuously rotated bythe wheel M upon the arbor of the third wheel of the watch; but it givesmotion to the chronograph-hand S only when the cone 1? is pressed intothe conical recess provided for it in the upper surface of the pinion O.The axis It is constantly pressed upon by the spring J, and as soon asthe spring-lever Q, ceases to hold it in the position shown in Fig. 2the axis R, with heart-cam P, is moved downward toward the pinion O, andthe cone 1? passes into the corresponding recess in the pinion O, andthe hand S is caused to turn until the push-pin A is again acted upon,and the spring-lever Q raises the cam I? and axis R. Upon the under sideof the lever-spring Qthere is a projection, (shown in Fig. 6,) againstwhich the lever F acts to cause said lever Q and heart-cam P to assumethe position shown in Figs. 1 and 2.

In Fig. 1 the lever E F is shown in the position in which the extremityof E engages in one of the three notches of cam M, and the le ver Fpresses against the heart-cam P and causes the hand S to point to twelveo clock. Now, if the push-piece A is acted upon, it

causes the cliclcwheel D to advance one of its nine teeth, and the cam Mcomes into the position shown in Fig. 3. The extremity ofE lies thenagainst the bearing 2, and lever F is thrown into a position in whichthe lever Q; is not raised by F, and in which the cone P is pressed intothe conical recess of the pinion O by the spring J. The hand S isthereby caused to turn as long as the lever E lies against the bearing2. By a further action of the pushplece A the ratchet-wheel D is causedagain to advance one tooth and the lever E comes to lean against thebearing 3 of calnh The 1ever F is now thrown under the beveled part ofthe spring-lever Q, which is raised thereby, causing thechronograph-hand to be stopped. If the push-piece A is again acted upon,the lever E 'alls into notch at and lever F presses the heart-cam 1 intothe position in which the ohronograplrhand S rests at twelve oclock. Theunder part of Q is formed so as to be held in its raised position untilthe lever E is again moved by and rests upon the part 5 of 0am M, whenthe hand S will be set in motion and the operations repeated.

' I clalm as my invention- 1. The combination, in a stopwatch, with theheart-cam P, the axis R, passing through and secured to the heart-cam,and the plate K, of the pinion O and the wheel and pinion V, having acannon-arbor passing through the plate K, and a tubular arbor, uponwhich the pinion O is revolved continuously, and through which the axisR passes, substantially as specilied.

2. In astop-watch, aca1n,M, having notches 1, 4, and 7 andbearing-surfaces in two series, 2, 5, and 8 and 3, 6, and 9, formed asarcs of circles upon the periphery of the cam, in combination with thelevers E F upon a pivot, F, and operated by said cam M and thepush-piece A, pawl, and ratchet, substantially as specitied.

The combination, in a stopwatch, with the axis it, springs J and Q, andpinion 0, having a conically-reccssed end, of the heartcam 1, collar P,and cone P, said collar and cone being made in one with the hcart'camand upon opposite sides of the same, substantially as specified.

' PAUL VUILLE PER tET.

Witnesses:

ALB. W'asRHMaNN, M. VENRY.

